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The Pershing Map FDR's hand-drawn map from 1938. The United States government's efforts to construct a national network of highways began on an ad hoc basis with the passage of the Federal Aid Road Act of 1916, which provided $75 million over a five-year period for matching funds to the states for the construction and improvement of highways. [8]
In addition to the 48 contiguous states, Interstate Highways are found in Hawaii, Alaska, and Puerto Rico. The Federal Highway Administration funds four routes in Alaska and three routes in Puerto Rico under the same program as the rest of the Interstate Highway System. However, these routes are not required to meet the same standards as the ...
Auxiliary Interstate Highways (also called three-digit Interstate Highways) are a subset of highways within the United States' Interstate Highway System.The 323 auxiliary routes generally fall into three types: spur routes, which connect to or intersect the parent route at one end; bypasses, which connect to the parent route at both ends; and beltways, which form a circle that intersects the ...
See three-way junction 5-1-1 A transportation and traffic information telephone hotline in some regions of the United States and Canada that was initially designated for road weather information. A Access road See frontage road Advisory speed limit A speed recommendation by a governing body. All-way stop or four-way stop An intersection system where traffic approaching it from all directions ...
The longest segment of Interstate Highway in Texas is I-10 at 878.6 miles (1,414.0 km); the shortest is I-110 at 0.9 miles (1.4 km). The construction of the Interstate Highway System in Texas began well before these routes were designated as Interstate Highways.
The speed limit is also reduced to 45 mph (70 km/h) for cars and 20 mph (30 km/h) for trucks. The highway returns to Interstate standard for about 50 miles until it reaches the Sault Ste. Marie International Bridge, which carries undivided lanes to the Canada–US border in the middle of the bridge, where I-75 terminates.
The bridge was designed before the start of the Interstate Highway System, and it was grandfathered into the system. [7] Interstate 93 super two through Franconia Notch, New Hampshire. Interstate 93 through Franconia Notch, New Hampshire is also a notable exception, being a super two parkway with a speed limit of 45 mph (72 km/h).
Interstate 30 (I-30 [a]) is a major Interstate Highway in the southern states of Texas and Arkansas in the United States. I-30 travels 366.76 miles from I-20 west of Fort Worth, Texas , northeast via Dallas , and Texarkana, Texas , to I-40 in North Little Rock, Arkansas .